Gases and Their Behavior

According to the kinetic theory, collisions between molecules in a gas

• are perfectly elastic.

• are inelastic.

• never occur.

• cause a loss of total kinetic energy.

Which of the following statements is part of the kinetic theory?

• The particles of a gas move independently of each other.

• The particles in a gas move rapidly.

• The particles in a gas are relatively far apart.

• All of these.

Particles in a gas are best described as

• slow-moving, kinetic, hard spheres.

• spheres that are in fixed positions when trapped in a container.

• small, hard spheres with insignificant volumes.

• hard spheres influenced by repulsive forces from other spheres.

What is the SI unit of pressure?

• candela

• mole

• pascal

• newton

What causes gas pressure in a container such as a helium balloon?

• the walls of the container

• the vacuum maintained in the container

• the simultaneous collisions of fast-moving particles in the container

• atmospheric pressure acting on the outside walls of the container

What happens to the average kinetic energy of the particles in a sample of matter as the temperature of the sample is increased?

• The average kinetic energy decreases.

• The average kinetic energy increases.

• The average kinetic energy does not change.

• The change in average kinetic energy cannot be determind.

With which temperature scale is temperature directly proportional to average kinetic energy?

• Celsius

• Fahrenheit

• Kelvin

• centigrade

Why does the pressure inside a container of gas increase if more gas is added to the container?

• There is an increase in the number of collisions between particles and the walls of the container.

• There is an increase in the temperature of the gas.

• There is a decrease in the volume of the gas.

• There is an increase in the force of the collisions between the particles and the walls of the container.

If the volume of a container of gas is reduced, what will happen to the pressure inside the container?

• The pressure will increase.

• The pressure will not change.

• The pressure will decrease.

• The pressure depends on the type of gas.

As the temperature of a the gas in a balloon decreases, which of the following occurs?

• The volume of the balloon increases.

• The average kinetic energy of the gas decreases.

• The gas pressure inside the balloon increases.

• all of these